{"id":"CVE-2026-4603","aliases":["EUVD-2026-14380","GHSA-464q-cqxq-xhgr"],"status":"published","title":"jsrsasign: Division by Zero Allows Invalid JWK Modulus to Cause Deterministic Zero Output in RSA Operations","description":"Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js. An attacker can force RSA public-key operations (e.g., verify and encryption) to collapse to deterministic zero outputs and hide “invalid key” errors by supplying a JWK whose modulus decodes to zero.","severity":{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00102,"percentile":0.00919,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-369"],"published":"2026-03-23T05:00:14Z","modified":"2026-10-28T02:31:13Z","fixes":[{"ecosystem":"npm","package":"jsrsasign","fixed_in":["11.1.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"jsrsasign","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11.1.1"}]}]},{"source":"osv","ecosystem":"npm","package":"jsrsasign","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"11.1.1"}]}]}],"products":[{"vendor":"kjur","product":"jsrsasign"}],"references":[{"url":"https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176","tags":["Third Party Advisory","web"]},{"url":"https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3","tags":["Exploit","Mitigation","Third Party Advisory","web"]},{"url":"https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f","tags":["Patch","fix","web"]},{"url":"https://github.com/kjur/jsrsasign/pull/649","tags":["Issue Tracking","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4603","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-464q-cqxq-xhgr"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4603.json","tags":["advisory"]},{"url":"https://github.com/kjur/jsrsasign","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-4603","description":"Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js. An attacker can force RSA public-key operations (e.g., verify and encryption) to collapse to deterministic zero outputs and hide “invalid key” errors by supplying a JWK whose modulus decodes to zero.","status":"published","published":"2026-03-23T05:00:14.06Z","modified":"2026-03-23T14:42:16.345Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium","assessor":"cna"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P","level":"medium","assessor":"cna"}],"cwes":["CWE-369"],"updated_at":"2026-11-02T14:19:59.761005Z"}],"euvd":[{"id":"EUVD-2026-14380","description":"Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js. An attacker can force RSA public-key operations (e.g., verify and encryption) to collapse to deterministic zero outputs and hide “invalid key” errors by supplying a JWK whose modulus decodes to zero.","status":"published","published":"2026-03-23T05:00:14Z","modified":"2026-03-23T14:42:16Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium"}],"updated_at":"2026-11-02T19:25:31.168902Z"}],"ghsa":[{"id":"GHSA-464q-cqxq-xhgr","title":"jsrsasign: Division by Zero Allows Invalid JWK Modulus to Cause Deterministic Zero Output in RSA Operations","description":"Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js. An attacker can force RSA public-key operations (e.g., verify and encryption) to collapse to deterministic zero outputs and hide “invalid key” errors by supplying a JWK whose modulus decodes to zero.","status":"published","published":"2026-03-23T06:30:29Z","modified":"2026-03-30T19:30:17Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","level":"low"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"cwes":["CWE-369"],"updated_at":"2026-11-02T14:39:46.119458Z"}],"nvd":[{"id":"CVE-2026-4603","description":"Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js. An attacker can force RSA public-key operations (e.g., verify and encryption) to collapse to deterministic zero outputs and hide “invalid key” errors by supplying a JWK whose modulus decodes to zero.","status":"published","published":"2026-03-23T06:16:22.233Z","modified":"2026-06-22T03:18:31.867Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"primary"}],"cwes":["CWE-369"],"updated_at":"2026-11-02T14:12:10.568062Z"}],"osv":[{"id":"CVE-2026-4603","description":"Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js. An attacker can force RSA public-key operations (e.g., verify and encryption) to collapse to deterministic zero outputs and hide “invalid key” errors by supplying a JWK whose modulus decodes to zero.","status":"published","published":"2026-03-23T05:00:14.06Z","modified":"2026-10-28T02:31:13.530434482Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","level":"low"}],"cwes":["CWE-369"],"updated_at":"2026-11-02T15:45:05.870292Z"},{"id":"GHSA-464q-cqxq-xhgr","title":"jsrsasign: Division by Zero Allows Invalid JWK Modulus to Cause Deterministic Zero Output in RSA Operations","description":"Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js. An attacker can force RSA public-key operations (e.g., verify and encryption) to collapse to deterministic zero outputs and hide “invalid key” errors by supplying a JWK whose modulus decodes to zero.","status":"published","published":"2026-03-23T06:30:29Z","modified":"2026-03-30T19:56:21.371329Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium"},{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","level":"low"}],"cwes":["CWE-369"],"updated_at":"2026-11-02T15:46:36.434231Z"}]}}